Question: Who is {sister} of {musical artist} of {That Song in My Head} ?
Paraphrase: Who is {sister} of {melodic craftsman} of {That Tune in My Head} ?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q3985542 wdt:P175 ?X . ?X wdt:P3373 ?answer}
Answer: Derek Hough